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A Facile Synthetic Approach for Zn2TiO4@NiCo2O4 Core‐Shell Nanoparticles Using Layered Double Hydroxide Precursors and Studies on Their Peroxidase‐Like Activity

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Zn2TiO4@NiCo2O4 core-shell nanoparticles, synthesized using Zn2TiO4@Ni−Co-LDH as precursors show better peroxidase-like activity compared to pure NiCo2O4 nanoparticles and natural horse radish peroxidase enzyme.


In the present work, a facile synthetic approach has been developed for Zn2TiO4@NiCo2O4 core-shell nanoparticles (NPs) using layered double hydroxide (LDH) as precursors. The Zn2TiO4 microspheres (ZTS) constitute the core and the shell consists of NiCo2O4 nanoparticles. X-ray diffraction (XRD) results confirm presence of both Zn2TiO4 and NiCo2O4 phases in Zn2TiO4@NiCo2O4 core-shell nanoparticles. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses indicate formation of hierarchical porous shell structure of NiCo2O4 with varying thickness (132±20 nm to 171±35 nm) on the Zn2TiO4 spheres. Optical studies indicate bandgap of ~2.2 eV corresponding to NiCo2O4 nanoparticles in the Zn2TiO4@NiCo2O4 core-shell nanoparticles. The Zn2TiO4@NiCo2O4 core-shell nanoparticles possess high surface area (124 m2/g to 160 m2/g) as measured from Brunauer-Emmett-Teller (BET) analysis. Magnetic studies of Zn2TiO4@NiCo2O4 core-shell nanoparticles indicate soft ferromagnetic and hard ferromagnetic behavior at 300 K and 5 K, respectively. The Zn2TiO4@NiCo2O4 core-shell nanoparticles act as nanozyme and they exhibit better peroxidase-like activity as compared to pure NiCo2O4 NPs and natural horseradish peroxidase (HRP).

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